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Virus neutralization titres in sera and nasal secretions of cattle after BHV-1 challenge. Virus neutralization titres of (a) sera and (b) nasal secretions. Mean titres + SEM are expressed as the reciprocal of the highest dilution of serum that caused a 50% reduction in viral plaques relative to the virus control. Asterisks (***P<0·001) indicate significance of differences from the saline group. Two animals injected with saline died on days 11 and 12 post-challenge.
